Internal pressure operated circulating valve with annulus pressure operated safety mandrel
US6230811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Jan 27, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole tool (100) for selectively providing fluid communication between the interior and the exterior of the tool (100). The tool (100) comprises a housing (102), a safety mandrel (130) slidably received within the housing (102) and an operating mandrel (114) slidably received within the housing (102). The safety mandrel (130) operates between a first position and a second position relative to the housing (102) in response to pressure being applied to the exterior of the housing (102). The operating mandrel (114) operates from a noncirculating position to a circulating position in response to pressure being applied to the interior of the housing (102) once the safety mandrel (130) has operated to its second position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.